Wiring system

Abstract

To aim at expanding an application range of very thin electric wires.SOLUTION: A wiring system 1 includes: a trunk line side wiring member 2 which includes a plurality of trunk line side circuits 3, and a plurality of trunk line side connectors 4a, 4b, 4c, and in which the plurality of trunk line side circuits are collected in a form having a plurality of connection ends 3Ea, 3Eb, 3Ec; and terminal side wiring members 5a, 5b, 5c which include terminal side connectors 6a, 6b, 6c connected to any one of the plurality of trunk line side connectors, and a terminal side circuit 7 connected to the terminal side connectors. The plurality of trunk line side connectors include very thin electric wire connectors, and the plurality of trunk line side circuits include a plurality of very thin electric wire connector connection circuits connected to the very thin electric wire connectors. The plurality of very thin electric wire connector connection circuits include very thin electric wires 3a having a conductor cross-sectional area of 0.13 sq or less as thinnest electric wires having the smallest conductor cross-sectional area.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a wiring system.

Background Art

[0002] Patent Document 1 discloses a configuration in which a connector is provided at a branching point of a main harness, and another harness connected to an in-vehicle device is connector-connected to the connector at the branching point.

[0003] Similar configurations are disclosed in Patent Documents 2 to 4.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] From the viewpoints of cost reduction and weight reduction, it is desirable to use ultra-fine wires with a small conductor cross-sectional area. On the other hand, ultra-fine wires have restrictions regarding the applicable locations from the viewpoints of tensile strength, impact resistance, etc.

[0006] Therefore, an object of the present disclosure is to expand the applicable locations of ultra-fine wires.

Means for Solving the Problems

[0007] The wiring system of the present disclosure includes a plurality of trunk-side circuits and a plurality of trunk-side connectors. The plurality of trunk-side circuits are grouped in a form having a plurality of connection ends, and the plurality of trunk-side connectors are connected to each of the plurality of connection ends. The trunk-side wiring member, a terminal-side connector connected to any one of the plurality of trunk-side connectors, and a terminal-side circuit connected to the terminal-side connector. The terminal-side wiring member is configured such that when the terminal-side connector is connected to any one of the plurality of trunk-side connectors, the terminal-side circuit is electrically connected to at least a part of the plurality of trunk-side circuits. The plurality of trunk-side connectors include connectors for ultra-thin wires, and the plurality of trunk-side circuits include a plurality of ultra-thin wire connector connection circuits connected to the connectors for ultra-thin wires. The plurality of ultra-thin wire connector connection circuits include ultra-thin wires having a conductor cross-sectional area of 0.13 sq or less as the ultra-thinnest wires having the smallest conductor cross-sectional area, and it is a wiring system.

Advantages of the Invention

[0008] According to the present disclosure, the applicable locations of ultra-thin wires can be expanded.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0010] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be listed and described.

[0011] The wiring system of the present disclosure is as follows.

[0012] (1) A trunk-side wiring member including a plurality of trunk-side circuits and a plurality of trunk-side connectors, wherein the plurality of trunk-side circuits are grouped in a form having a plurality of connection ends, and the plurality of trunk-side connectors are connected to each of the plurality of connection ends; a terminal-side connector connected to any one of the plurality of trunk-side connectors; and a terminal-side circuit connected to the terminal-side connector. By connecting the terminal-side connector to any one of the plurality of trunk-side connectors, the terminal-side circuit is electrically connected to at least a part of the plurality of trunk-side circuits. The plurality of trunk-side connectors include connectors for ultra-fine wires, the plurality of trunk-side circuits include a plurality of ultra-fine wire connector connection circuits connected to the connectors for ultra-fine wires, and the plurality of ultra-fine wire connector connection circuits include ultra-fine wires having a conductor cross-sectional area of 0.13 sq or less as the ultra-thinnest wires having the smallest conductor cross-sectional area.

[0013] This wiring system includes a trunk-side wiring member and a terminal-side wiring member, and the connection end of the trunk-side wiring member can be connected to an electrical component via the terminal-side wiring member. Therefore, the length of the connection end can be reduced. If the length of the connection end can be reduced, it is difficult for a tensile force to act on the connection end during handling operations of the wiring member. Further, a plurality of ultra-thin wire connectors are connected to the ultra-thin wire connector, and the plurality of ultra-thin wire connector connection circuits include ultra-thin wires with a conductor cross-sectional area of 0.13 sq or less as the ultra-thinnest wire with the smallest conductor cross-sectional area. Therefore, even if a tensile force acts on the plurality of ultra-thin wire connector connection circuits connected to the ultra-thin wire connector, the tensile force is received by the plurality of ultra-thin wire connector connection circuits. As described above, it is difficult for the tensile force itself to act on the ultra-thinnest wire connected to the ultra-thin wire connector, and even if the tensile force acts, the force is dispersed among the plurality of ultra-thin wire connector connection circuits. Thereby, the applicable location of the ultra-thin wire can be expanded to the circuit connected to the ultra-thin wire connector of the trunk-side wiring member.

[0014] (2) The wiring system according to (1), wherein the plurality of trunk-side circuits include a multi-purpose circuit and trunk-side application-specific circuits, and as the terminal-side wiring member, a first-application wiring member including a first-application connector as the terminal-side connector and a first-application circuit as the terminal-side circuit, and a second-application wiring member including a second-application connector as the terminal-side connector and a second-application circuit as the terminal-side circuit are exclusively provided. When the first-application connector is connected to the ultra-thin wire connector, the multi-purpose circuit is connected to the first-application circuit, and when the second-application connector is connected to the ultra-thin wire connector, the multi-purpose circuit is connected to the second-application circuit. The trunk-side application-specific circuits may be connected to the first-application circuit when the first-application connector is connected to the ultra-thin wire connector, or may be connected to the second-application circuit when the second-application connector is connected to the ultra-thin wire connector.

[0015] In this case, the multi-purpose circuit is connected to both the first-purpose circuit and the second-purpose circuit. Therefore, compared with the case where the trunk-side wiring members separately prepare a circuit connected to the first-purpose circuit and a circuit connected to the second-purpose circuit, the total number of electric wires can be reduced. As a result, while reducing the number of circuits, it is possible to easily cope with the specifications of a plurality of vehicles. Since the plurality of trunk-side circuits have a multi-purpose circuit and a trunk-side circuit for each purpose, it is assumed that the number of circuits connected to the ultra-fine wire connector is larger than the number of circuits of the first-purpose circuit connected to the first-purpose connector or the number of circuits of the second-purpose circuit connected to the second-purpose connector. For this reason, when the ultra-thinnest wire is connected to the ultra-fine wire connector, the tensile force on the ultra-thinnest wire can be received by a larger number of circuits.

[0016] (3) The wiring system according to (1) or (2), wherein at least one of the plurality of trunk-side circuits connected to the ultra-fine wire connector may be in an open state with the terminal-side connector connected to the ultra-fine wire connector.

[0017] In this case, the opened circuit is not used for connection to other electrical components. By using such an opened circuit, the tensile force on the ultra-thinnest wire can be dispersed.

[0018] (4) The wiring system according to any one of (1) to (3), wherein the ultra-thinnest wire may be an ultra-fine wire having a conductor cross-sectional area of 0.08 sq or less. If the ultra-thinnest wire is a thinner wire, it is possible to further reduce the weight and cost of the wiring system.

[0019] (5) The wiring system according to any one of (1) to (4), wherein the terminal-side wiring member includes a plurality of the terminal-side circuits, and in a state where the terminal-side connector is connected to the ultra-fine wire connector, the plurality of terminal-side circuits may branch from the terminal-side connector and be connected to a plurality of electrical components.

[0020] In this case, the number of terminal-side circuits at the branching point is larger than the number of terminal-side circuits at each branching destination. The terminal-side circuits at the branching point are connected to a terminal-side connector, and the terminal-side connector is connected to a connector for ultra-thin wires. Therefore, the number of circuits connected to the connector for ultra-thin wires can also be made larger than the number of terminal-side circuits at the branching destination. By connecting an ultra-ultra-thin wire to such a connector for ultra-thin wires, the force acting on the ultra-ultra-thin wire can be dispersed and received by a larger number of circuits.

[0021] (6) A wiring system according to any one of (1) to (5), wherein the ratio of the number of the ultra-thin wires having a conductor cross-sectional area of 0.13 sq or less to the total number of the plurality of trunk-side circuits may be 40% or more. Thereby, the trunk-side wiring member can be made lighter and less costly.

[0022] (7) A wiring system according to any one of (1) to (6), wherein the terminal-side circuit has a relatively thick wire having a conductor cross-sectional area larger than that of the ultra-ultra-thin wire, and the ultra-ultra-thin wire may be connected to the relatively thick wire by connecting the terminal-side connector to the connector for ultra-thin wires.

[0023] Regarding the terminal-side circuit that is the connection destination of the connector for ultra-thin wires, it extends longer than the trunk line, is likely to be subjected to a tensile force, and the number thereof is likely to be small. Therefore, for the terminal-side circuit, by adopting a configuration having a relatively thick wire thicker than the ultra-ultra-thin wire, even if a tensile force acts on the relatively thick wire, the tensile force can be received by its own strength.

[0024] [Details of Embodiments of the Present Disclosure] A specific example of the wiring system of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, and is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0025] [Embodiment 1] Hereinafter, the wiring system according to Embodiment 1 will be described. FIG. 1 is an explanatory diagram showing the wiring system.

[0026] <Overall Configuration> The overall configuration of the wiring system 1 will be described. The wiring system 1 includes a trunk - side wiring member 2 and terminal - side wiring members 5a, 5b, 5c. The wiring system 1 is a system for electrically connecting electrical components 9A, 9B, 9C, 9D, 9E. The trunk - side wiring member 2 is a wiring member including a main trunk 3M in which circuits connected to the electrical components 9A, 9B, 9C, 9D, 9E are grouped together. The terminal - side wiring members 5a, 5b, 5c are wiring members including device - side circuits extending from the main trunk 3M toward each of the electrical components 9A, 9B, 9C, 9D, 9E. The main trunk 3M may be a portion where the most circuits are grouped along one path. The portion of the trunk - side wiring member 2 along the main trunk 3M may be fixed to the vehicle. The fixing location may be, for example, the reinforcement R in the vehicle. The device - side circuits may have the same number of circuits as the number of circuits at the location where the most circuits in the main trunk 3M are grouped, or may have fewer circuits than that number.

[0027] The trunk - side wiring member 2 includes a plurality of trunk - side circuits 3 and a plurality of trunk - side connectors 4a, 4b, 4c.

[0028] The trunk - side circuit 3 is an electrical transmission medium having an elongated conductor. In this embodiment, the trunk - side circuit 3 is a coated wire having a core wire and a coating. The core wire may be a single - core wire or a stranded wire in which a plurality of strands are twisted together. The coating is formed, for example, by extrusion - coating resin around the core wire.

[0029] The plurality of trunk-side circuits 3 are grouped in a form having a plurality of connection terminals 3Ea, 3Eb, and 3Ec. In the present embodiment, the plurality of trunk-side circuits 3 are grouped along one trunk 3M. The method of grouping the plurality of trunk-side circuits 3 on the trunk 3M is arbitrary. For example, the plurality of trunk-side circuits 3 may be kept bundled by a bundling member 3B such as an adhesive tape or a binding band. Also, the plurality of trunk-side circuits may be fixed and grouped by welding such as ultrasonic welding to a strip-shaped sheet.

[0030] The connection terminal 3Ea is located on one end side of the trunk 3M, the connection terminal 3Ec is located on the other end side of the trunk 3M, and the connection terminal 3Eb is located at an intermediate portion in the longitudinal direction of the trunk 3M. The connection terminals 3Ea, 3Eb, and 3Ec are located. In the present embodiment, the trunk 3M is a linear portion, and the connection terminals 3Ea, 3Eb, and 3Ec extend in a direction intersecting the trunk 3M and away from the trunk 3M. In the portion where the trunk-side circuit 3 extends away from the trunk 3M, the trunk-side circuit 3 may or may not be bundled.

[0031] At each of the connection terminals 3Ea, 3Eb, and 3Ec, the ends of the trunk-side circuit 3 are aligned. At each of the connection terminals 3Ea, 3Eb, and 3Ec, connector terminals are attached to the ends of the trunk-side circuit 3 by crimping or the like. A plurality of trunk-side connectors 4a, 4b, and 4c are connected to each of the plurality of connection terminals 3Ea, 3Eb, and 3Ec.

[0032] The trunk-side connectors 4a, 4b, and 4c are connectors that are connected to the terminal-side connectors 6a, 6b, and 6c. The trunk-side connectors 4a, 4b, and 4c have, for example, a resin connector housing having a plurality of cavities. By inserting the connector terminals of the trunk-side circuit 3 into each of the plurality of cavities of the resin connector housing, a plurality of trunk-side connectors 4a, 4b, and 4c are connected to each of the plurality of connection terminals 3Ea, 3Eb, and 3Ec.

[0033] The lengths of the connection terminals 3Ea, 3Eb, and 3Ec from the trunk - side circuit 3 are arbitrary. The length L of the connection terminals 3Ea, 3Eb, and 3Ec from the trunk - side circuit 3 may be, for example, 20 cm or less, or 15 cm or less, or 10 cm or less. The length L of the connection terminals 3Ea, 3Eb, and 3Ec from the trunk - side circuit 3 may be, for example, the distance from the starting point where the connection terminals 3Ea, 3Eb, and 3Ec bend and extend from the trunk - side circuit 3 to the proximal ends of the trunk - side connectors 4a, 4b, and 4c.

[0034] The terminal - side wiring members 5a, 5b, 5b include terminal - side connectors 6a, 6b, 6c and a terminal - side circuit 7.

[0035] The terminal - side connectors 6a, 6b, 6c are respectively connected to the trunk - side connectors 4a, 4b, 4c. The terminal - side connectors 6a, 6b, 6c, for example, the trunk - side connectors 4a, 4b, 4c, for example, have a resin connector housing having a plurality of cavities. By inserting the connector terminals attached to the end portions of the terminal - side circuit 7 into each of the plurality of cavities of the resin connector housing, one end portion of the terminal - side circuit 7 is connected to each of the terminal - side connectors 6a, 6b, 6c.

[0036] The terminal - side circuit 7 is an electrical transmission medium having an elongated conductor. In the present embodiment, the terminal - side circuit 7 is, like the trunk - side circuit 3, a covered electric wire having a core wire and a covering. As described above, one end portion of the terminal - side circuit 7 is connected to any one of the terminal - side connectors 6a, 6b, 6c. The other end portion of the terminal - side circuit 7 is connected to any one of the electrical components 9A, 9B, 9C, 9D, 9E. The other end portion of the terminal - side circuit 7 may be connected to the electrical components 9A, 9B, 9C, 9D, 9E via a connector C. The other end portion of the terminal - side circuit 7 may be directly connected to the terminals of the electrical components 9A, 9B, 9C, 9D, 9E by soldering, welding, crimping, etc.

[0037] The terminal - side wiring members 5a, 5b, 5c will be described separately.

[0038] The terminal-side wiring member 5a includes a plurality (five in FIG. 7) of terminal-side circuits 7, and one end of each terminal-side circuit 7 is connected to the terminal-side connector 6a. When the terminal-side connector 6a is connected to the trunk-line side connector 4a, the terminal-side circuits 7 are electrically connected to at least a part of the plurality of trunk-line side circuits 3. In this embodiment, the number of the plurality of ends of the trunk-line side circuits 3 at the connection end 3Ea is the same as the number of the plurality of one ends of the terminal-side circuits 7, and the ends of the trunk-line side circuits 3 at the connection end 3Ea and the one ends of the terminal-side circuits 7 of the terminal-side wiring member 5a are connected in a one-to-one correspondence.

[0039] The plurality of terminal-side circuits 7 branch on the way to the electrical components 9A and 9B. Among the plurality of terminal-side circuits 7, the first group of the branch destinations is connected to the electrical component 9A, and the second group of the branch destinations is connected to the electrical component 9B. It is not essential that the plurality of terminal-side circuits 7 branch into a plurality and are connected to a plurality of electrical components. Also, the plurality of terminal-side circuits 7 may not branch and may be connected to a single electrical component.

[0040] The terminal-side wiring member 5b includes a plurality (four in FIG. 7) of terminal-side circuits 7, and one end of each terminal-side circuit 7 is connected to the terminal-side connector 6b. When the terminal-side connector 6b is connected to the trunk-line side connector 4b, the terminal-side circuits 7 are electrically connected to at least a part of the plurality of trunk-line side circuits 3. In this embodiment, similar to the connection end 3Ea, the number of the plurality of ends of the trunk-line side circuits 3 at the connection end 3Eb is the same as the number of the plurality of one ends of the terminal-side circuits 7.

[0041] The plurality of terminal-side circuits 7 do not branch on the way to the electrical component 9C and are connected to the common electrical component 9C. In the terminal-side wiring member 5b, the plurality of terminal-side circuits 7 may branch into a plurality.

[0042] The terminal-side wiring member 5c includes a plurality (four in FIG. 7) of terminal-side circuits 7, and one end of the terminal-side circuit 7 is connected to the terminal-side connector 6c. When the terminal-side connector 6c is connected to the trunk-line side connector 4c, the terminal-side circuit 7 is electrically connected to at least a part of the plurality of trunk-line side circuits 3. In the present embodiment, similar to the connection end 3Ea, the number of the plurality of end portions of the trunk-line side circuit 3 at the connection end 3Ec is the same as the number of the plurality of one ends of the terminal-side circuit 7.

[0043] The plurality of terminal-side circuits 7 branch on the way to the electrical components 9D and 9E. Among the plurality of terminal-side circuits 7, the first group of the branch destinations is connected to the electrical component 9D, and the second group of the branch destinations is connected to the electrical component 9E. It is not essential that the plurality of terminal-side circuits 7 branch into a plurality and are connected to a plurality of electrical components. Also, the plurality of terminal-side circuits 7 may not branch and may be connected to a single electrical component.

[0044] In each of the terminal-side wiring members 5a, 5b, and 5c, the number of the terminal-side circuits 7 connected to the terminal-side connectors 6a, 6b, and 6c does not need to be the same as the number of the trunk-line side circuits 3 connected to the trunk-line side connectors 4a, 4b, and 4c which are the connection destinations. The former number may be more or less than the latter number.

[0045] Note that as the electrical components, various electrical components mounted on the vehicle are assumed. As the electrical components, for example, a display device that displays various information to the driver, a switch that receives various instructions from the driver, an ECU (Electronic Control Unit), a driving component (such as a motor) that drives each part, a sensor that detects various states, etc. are assumed.

[0046] <Regarding the application of ultra-fine wires> An application example of the ultra-fine wire in the wiring system 1 will be described.

[0047] A plurality of trunk-side connectors 4a, 4b, 4c includes connectors for ultra-thin wires. In the present embodiment, the plurality of trunk-side connectors 4a, 4b, 4c are connectors for ultra-thin wires. Note that the connector for ultra-thin wires refers to a connector to which at least one ultra-thin wire is connected, and does not mean only a connector to which only ultra-thin wires are connected. Therefore, a wire thicker than the ultra-thin wire may be connected to the connector for ultra-thin wires. Of course, only ultra-thin wires may be connected to the connector for ultra-thin wires. The ultra-thin wire is a wire having an extremely small conductor cross-sectional area, for example, a wire having a conductor cross-sectional area of 0.13 sq or less. The ultra-thin wire may be, for example, a wire for signal transmission.

[0048] The plurality of trunk-side circuits 3 includes a plurality of ultra-thin wire connector connection circuits connected to the trunk-side connectors 4a, 4b, 4c as connectors for ultra-thin wires. In the present embodiment, all of the plurality of trunk-side circuits 3 are ultra-thin wire connector connection circuits.

[0049] For example, as described above, when the plurality of trunk-side connectors 4a, 4b, 4c includes connectors that are not connectors for ultra-thin wires, it is also conceivable that a part of the plurality of trunk-side circuits 3 is not an ultra-thin wire connector connection circuit. Note that the number of trunk-side circuits 3 connected to each of the trunk-side connectors 4a, 4b, 4c is arbitrary. For example, 20 to 30 trunk-side circuits 3 may be connected.

[0050] The trunk-side circuits 3 as the plurality of ultra-thin wire connector connection circuits include ultra-thin wires having a conductor cross-sectional area of 0.13 sq or less as the ultra-thinnest wires having the smallest conductor cross-sectional area. Hereinafter, for convenience of explanation, there may be a case where the ultra-thinnest wire 3a among the trunk-side circuits 3 is distinguished from a wire 3b having a larger conductor cross-sectional area than the ultra-thinnest wire 3a. Also, in FIG. 1, for convenience, the ultra-thinnest wire 3a is shown as a thinner line than the wire 3b.

[0051] Here, "sq" is an abbreviation of "square" and means square millimeters. Therefore, an ultra-fine wire with a conductor cross-sectional area of 0.13 sq means an ultra-fine wire with a conductor cross-sectional area of 0.13 square millimeters. Thus, an ultra-fine wire with a conductor cross-sectional area of 0.13 sq or less means an ultra-fine wire with a conductor cross-sectional area of 0.13 square millimeters or less. An ultra-fine wire with a conductor cross-sectional area of 0.13 sq may be understood as a wire conforming to 0.13 sq in the JIS standard. Therefore, an ultra-fine wire with a conductor cross-sectional area of 0.13 sq or less may be a wire conforming to 0.13 sq in the JIS standard, or may be a wire with a smaller conductor cross-sectional area than that wire. For example, an ultra-fine wire with a conductor cross-sectional area of 0.13 sq or less may be a wire with a conductor cross-sectional area of 0.1 sq, a wire with a conductor cross-sectional area of 0.08 sq, or a wire with a conductor cross-sectional area of 0.05 sq in the JIS standard. Also, for example, an ultra-fine wire with a conductor cross-sectional area of 0.13 sq or less may be a wire conforming to AWG22 in the American Wire Gauge standard, and a wire with a smaller conductor cross-sectional area than the wire conforming to AWG22 (for example, a wire of AWG26, etc.). In this embodiment, unless otherwise specified, the description is made assuming that the ultra-thinnest wire 3a is an ultra-fine wire with a conductor cross-sectional area of 0.13 sq or less. From the viewpoint of resistance to wire breakage due to vibration or the like, the conductor cross-sectional area of the ultra-fine wire is preferably 0.002 sq or more.

[0052] In the example shown in FIG. 1, a part of the trunk-side circuit 3 is the ultra-thinnest wire 3a, and the remainder is a wire 3b with a larger conductor cross-sectional area than the ultra-thinnest wire 3a. The wire 3b may be, for example, a wire with a conductor cross-sectional area exceeding 0.13 sq, for example, a wire with a conductor cross-sectional area of 0.35 sq, 0.5 sq, 0.75 sq, 1.25 q, or a wire with a larger conductor cross-sectional area. The wire 3b does not necessarily include only a wire of a single type of conductor cross-sectional area, and may include wires of various conductor cross-sectional areas. If the ultra-thinnest wire 3a is a thinner wire, for example, an ultra-fine wire with a conductor cross-sectional area of 0.1 sq, the wire 3b may include a wire with a conductor cross-sectional area of 0.13 sq. At least a part of the wire 3b may be a wire for power supply or grounding. The trunk-side wiring member includes a plurality of types of wires with different conductor cross-sectional areas, and it can also be understood that the minimum value of the conductor cross-sectional areas of the plurality of types of wires is 0.13 sq or less.

[0053] In this embodiment, the main circuit 3 connecting the main connector 4a and the main connector 4b includes one ultra-thin wire 3a and two wires 3b. The main circuit 3 connecting the main connector 4a and the main connector 4c includes two ultra-thin wires 3a and two wires 3b. The main circuit 3 connecting the main connector 4b and the main connector 4b includes one ultra-thin wire 3a.

[0054] The number and application locations of the ultra-thin wires 3a and the wires 3b in the main circuit 3 are arbitrary. For example, one of the main circuits 3 may be the ultra-thin wire 3a, or all of the main circuits 3 may be the ultra-thin wires 3a.

[0055] Here, as described above, the ultra-thin wire is defined as a wire with a conductor cross-sectional area of 0.13 sq or less. If the ultra-thin wire 3a is a wire with a conductor cross-sectional area of 0.13 sq, the number of ultra-thin wires in the main circuit 3 is the same as the number of ultra-thin wires 3a. If the ultra-thin wire 3a is a wire with a conductor cross-sectional area less than 0.13 sq, the number of ultra-thin wires in the main circuit 3 is the number obtained by adding the number of ultra-thin wires with a conductor cross-sectional area of 0.13 or less among the wires 3b to the number of ultra-thin wires 3a.

[0056] In this case, the ratio of the number of ultra-thin wires with a conductor cross-sectional area of 0.13 sq or less to the total number of the plurality of main circuits 3 may be 40% or more, or may be 50% or more. The ratio may be 70% or less, or may be 60% or less. In the example shown in FIG. 1 of this embodiment, the ratio of 3 ultra-thin wires with a conductor cross-sectional area of 0.13 sq or less to the total number of 7 main circuits 3 is approximately 42.9%.

[0057] The conductor cross-sectional area of the terminal-side circuit 7 in the terminal-side wiring members 5a, 5b, and 5c is arbitrary. The conductor cross-sectional area of the terminal-side circuit 7 may be larger than, for example, the conductor cross-sectional area of the above-mentioned ultra-thin wire 3a. For example, the conductor cross-sectional area of the terminal-side circuit 7 may be a wire with a conductor cross-sectional area exceeding 0.13 sq. For example, the conductor cross-sectional area of the terminal-side circuit 7 may be, for example, a wire with a conductor cross-sectional area of 0.35 sq, 0.5 sq, 0.75 sq, 1.25 q, or a wire with a larger conductor cross-sectional area. The terminal-side circuit 7 does not necessarily need to include only wires of a single type of conductor cross-sectional area, and may include wires of various conductor cross-sectional areas. The terminal-side circuit 7 may include a wire with a conductor cross-sectional area of 0.13 sq or less.

[0058] FIG. 2 is an explanatory diagram showing an example of the connection between the ultra-thin wire 3a and the terminal-side circuit 7. As shown in the figure, a connector terminal 3T is connected to the end of the ultra-thin wire 3a, and the connector terminal 3T is inserted into the cavity of the trunk-side connector 4b. The ultra-thin wire 3a has a core wire 3p and a coating 3q that covers the core wire 3p. A connector terminal 7T is connected to the end of the terminal-side circuit 7 that is the connection destination of the ultra-thin wire 3a, and the connector terminal 7T is inserted into the terminal-side connector 6b. The terminal-side circuit 7 has a core wire 7p and a coating 7q that covers the core wire 7p.

[0059] By connecting the trunk-side connector 4b and the terminal-side connector 6b, the core wire 3p of the ultra-thin wire 3a is electrically connected to the core wire 7p of the terminal-side circuit 7. The conductor cross-sectional area of the core wire 3p is smaller than the conductor cross-sectional area of the core wire 7p. The above-mentioned terminal-side circuit 7 is an example of a relatively thick wire with a conductor cross-sectional area larger than that of the ultra-thin wire 3a.

[0060] <Effect> According to the wiring system 1 configured as described above, the wiring system 1 includes a trunk-side wiring member 2 and terminal-side wiring members 5a, 5b, 5c, and the connection ends 3Ea, 3Eb, 3Ec of the trunk-side wiring member 2 are connected to electrical components 9A, 9B, 9C, 9D, 9E via the terminal-side wiring members 5a, 5b, 5c. Therefore, compared with the case of directly extending an electric wire or the like from the path of the trunk line 3 and connecting it to the electrical components 9A, 9B, 9C, 9D, 9E, the length L of the connection ends 3Ea, 3Eb, 3Ec can be reduced. If the length L of the connection ends 3Ea, 3Eb, 3Ec can be reduced, it becomes difficult for the connection ends 3Ea, 3Eb, 3Ec to be caught by other parts during storage, transportation, vehicle assembly, etc. of the trunk-side wiring member 2, and it is difficult for a tensile force or impact to be applied to the connection ends 3Ea, 3Eb, 3Ec.

[0061] Further, a trunk-side circuit 3 as a plurality of ultra-thin wire connector connection circuits is connected to each of the trunk-side connectors 4a, 4b, 4c as ultra-thin wire connectors, and the plurality of trunk-side circuits 3 include an ultra-thin wire 3a with the smallest conductor cross-sectional area, that is, an ultra-thin wire with a conductor cross-sectional area of 0.13 sq or less. Therefore, even if a tensile force or impact force acts on the plurality of trunk-side circuits 3 connected to the trunk-side connectors 4a, 4b, 4c, the force is received by the plurality of trunk-side circuits 3.

[0062] As described above, it is difficult for a tensile force or impact force itself to act on the ultra-thin wire connected to the trunk-side connectors 4a, 4b, 4c at the ends of the shortened connection ends 3Ea, 3Eb, 3Ec, and even if a tensile force or impact force acts, the force is dispersed and received by the plurality of trunk-side circuits 3. Thereby, the applicable locations of the ultra-thin wire, particularly the ultra-thin wire 3a, can be expanded to the circuits connected to the trunk-side connectors 4a, 4b, 4c as ultra-thin wire connectors in the trunk-side wiring member 2.

[0063] In addition, since the ultra-thin wire 3a is lighter and less expensive compared to an electric wire with a larger conductor cross-sectional area, by expanding the applicable locations of the ultra-thin wire 3a, it is possible to reduce the weight and cost of the trunk-side wiring member 2.

[0064] In particular, by using an ultra-thin wire with a conductor cross-sectional area of 0.08 sq or less as the ultra-thinnest wire 3a, it becomes possible to further reduce the weight and cost of the wiring system.

[0065] Also, if the ratio of the number of ultra-thin wires with a conductor cross-sectional area of 0.13 sq or less (the number of ultra-thinnest wires 3a or the sum of the number of ultra-thinnest wires 3a and the number of ultra-thin wires among the wires 3b) to the total number of a plurality of trunk-side circuits 3 is 40% or more, the trunk-side wiring member 2 can be further reduced in weight and cost.

[0066] The terminal-side circuit 7 has a wire 3b as a relatively thick wire with a conductor cross-sectional area larger than that of the ultra-thinnest wire. By connecting the terminal-side connectors 6a, 6b, 6c to the trunk-side connectors 4a, 4b, 4c as ultra-thin wire connectors, the ultra-thinnest wire 3a is connected to the wire 3b as a relatively thick wire. Here, the terminal-side wiring members 5a, 5b, 5c may be longer than the connection ends 3Ea, 3Eb, 3Ec. During storage, transportation, and vehicle assembly of the terminal-side wiring members 5a, 5b, 5c, etc., they may get caught on other parts, and a tensile force or impact may act between the connection points to the terminal-side connectors 6a, 6b, 6c or the electrical components 9A, 9B, 9C, 9D, 9E and the terminal-side circuit 7. Also, depending on the presence or absence of mounting of the electrical components 9A, 9B, 9C, 9D, 9E to which connection is made, etc., the number of the terminal-side circuits 7 itself may be less than the number of the source wires 3a, 3b. When the number of the terminal-side circuits 7 itself is less than the number of the source wires 3a, 3b, a part of the source wires is not connected to the terminal-side circuit 7 and remains open. Furthermore, when the terminal-side circuit 7 branches into a plurality, as in the case of the terminal-side wiring members 5a, 5c, the number of the terminal-side circuits 7, which was the same as the number of the trunk-side circuits 3 at the branch point, may decrease at the branch destination.

[0067] Therefore, by configuring the terminal-side circuit 7 to have a relatively thick wire thicker than the ultra-thin wire 3a, even if a tensile force acts on the terminal-side circuit 7, the tensile force can be received by the strength of the relatively thick wire itself. As a result, as a whole wiring system 1, while increasing the utilization ratio of ultra-thin wires such as the ultra-thin wire 3a to achieve weight reduction and cost reduction, for locations where tensile strength and the like are required, it can be set to withstand the tensile force.

[0068] The terminal-side wiring members 5a, 5b, 5c may have ultra-thin wires, but the ratio of the number of ultra-thin wires to the total number of circuits in the terminal-side wiring members 5a, 5b, 5c is preferably smaller than the ratio of the number of ultra-thin wires to the total number of circuits in the trunk-side wiring member 2.

[0069] Looking at the connection terminals 3Ea, 3Ec with respect to the branched terminal-side wiring members 5a, 5c, the number of wires 3a, 3b connected to the connection terminals 3Ea, 3Ec is larger than the number of terminal-side circuits 7 at each branch destination in the terminal-side wiring members 5a, 5c. For this reason, when the ultra-thin wire 3a is connected to the terminal-side connectors 6a, 6c as such ultra-thin wire connectors, the force acting on the ultra-thin wire 3a can be dispersed and received by a larger number of wires 3a, 3b.

[0070] [Embodiment 2] The wiring system 30 according to Embodiment 2 will be described. As described in Embodiment 1, the configuration related to the trunk-side wiring member having the ultra-thin wire may be applied to the wiring system according to Embodiment 2. In the wiring system according to Embodiment 2, a multi-purpose wiring member, which is an example of the trunk-side wiring member, includes a plurality of circuits for electrical connection according to different specifications, and a part of the plurality of circuits is used for electrical connection with different specifications. Therefore, the number of circuits of the multi-purpose wiring member may be larger than the number of circuits of the wiring member for each specification, but smaller than the number of circuits of the wiring part obtained by simply combining the wiring members for each specification. Therefore, the multi-purpose wiring member is a wiring member that can handle different specifications with as few circuits as possible. In such a multi-purpose wiring member, by including ultra-thin wires with a conductor cross-sectional area of 0.13 sq or less as the ultra-thin wires with the smallest conductor cross-sectional area among the plurality of circuits, a configuration that can withstand tensile force, impact, etc. on the ultra-thin wires is realized, and the multi-purpose wiring member can be lightweight. Hereinafter, the wiring system including the multi-purpose wiring member will be described.

[0071] <Examples of systems equipped on vehicles> For the sake of convenience of explanation, an example of a system mounted on a vehicle will be described. FIG. 3 is a diagram showing a wiring system 30 in a vehicle 11. The vehicle 11 is equipped with a common equipment system 12. The common equipment system 12 is a system that is commonly mounted on vehicles of a specific platform or a specific vehicle model regardless of the grade difference and the difference in optional parts. For example, when a common instrument panel system is mounted on a vehicle of a specific platform or a specific vehicle model, the instrument panel system is an example of the common equipment system 12. The common equipment system 12 includes at least one electrical component 12a, 12b for realizing the functions of the common equipment system 12. For example, if the common equipment system 12 is an instrument panel system, the common equipment system 12 includes, as the electrical components 12a, 12b, a display device for displaying various information to the driver, a switch for receiving various instructions from the driver, an ECU, etc. The ECU performs, for example, display control of the display device, reception of instructions via the switch, and reception of various signals from various sensors and other ECUs. In FIG. 3, two electrical components 12a, 12b are illustrated, but the number and positions thereof are not particularly limited.

[0072] An exclusive equipment system 14 is set in the vehicle 11. The exclusive equipment system 14 is a system that can exclusively adopt the first equipment specification 16 and the second equipment specification 18 for the vehicle 11. Here, "exclusive" means that if any one of a plurality of situations is established, the other situations will not be established. For this reason, being able to exclusively adopt the first equipment specification 16 and the second equipment specification 18 means that if the first equipment specification 16 is adopted, the second equipment specification 18 cannot be adopted, and if the second equipment specification 18 is adopted, the first equipment specification 16 cannot be adopted. In this case, it is not excluded that the exclusive equipment system 14 can adopt, in addition to the first equipment specification 16 and the second equipment specification 18, the third equipment specification, the fourth equipment specification, etc. as other exclusive options.

[0073] An example of an exclusive equipment system is a case where the first equipment specification 16 is an AT (automatic transmission) specification and the second equipment specification 18 is an MT (manual transmission) specification. For example, if the first equipment specification 16 is an AT specification, the exclusive equipment system includes, as the electrical components 16a, 16b, 16c, and 16d, a sensor for detecting the position of a shift lever, a switch for receiving a command for an AT operation mode, an AT mechanism including various solenoids and various sensors for changing the rotation speed of a drive source, an AT ECU, and the like. The AT ECU controls the gear ratio in the AT mechanism according to, for example, the vehicle speed, the engine rotation speed, and accelerator operation. Also, for example, if the second equipment specification 18 is an MT specification, the exclusive equipment system includes, as the electrical components 18a, 18b, and 18c, a sensor for detecting the position of a shift lever, a sensor for detecting the position of a clutch pedal, an engine ECU, and the like. In this embodiment, a description will be given on the assumption that the first equipment specification 16 is an AT specification and the second equipment specification 18 is an MT specification. The AT specification and the MT specification are exclusively installed on the vehicle 11 as specifications in which the rotation of the driving source for traveling is transmitted to the wheels after being changed in speed.

[0074] Although FIG. 3 illustrates two electric components 12a and 12b, four electric components 16a, 16b, 16c, and 16d, and two electric components 18a, 18b, and 18c, the number and positions of these components are arbitrary.

[0075] Another example of an exclusive equipment system is a case where the first equipment specification is a mechanical key specification and the second equipment specification is a smart key specification. The mechanical key specification is a system in which the driver inserts the key they possess into a keyhole provided around the door, handle, etc., to open and close the lock of the vehicle door, switch to the unlocked state of the handle, and switch the power source to an operable state. The smart key specification is a system in which wireless communication is performed between a wireless communication device mounted on the vehicle and a wireless key terminal held by the driver to open and close the lock of the vehicle door, switch to the unlocked state of the handle, and switch the power source to an operable state. Note that the smart key specification may include a configuration related to the mechanical key specification. The mechanical key specification does not incorporate a configuration related to the smart key specification. The mechanical key specification and the smart key specification are exclusively mounted on the vehicle as security specifications for locking and unlocking each part of the vehicle.

[0076] Yet another example of an exclusive equipment system relates to the vehicle's driving power system, where the first equipment specification is a specification for an internal combustion engine and the second equipment specification is a specification for a hybrid using an internal combustion engine and an electric motor. In this case, the first equipment specification or the second equipment specification may be a specification for an electric motor. In addition to the first equipment specification and the second equipment specification, a specification for an electric motor may be set as the third equipment specification. These specifications are exclusively mounted on the vehicle as systems related to the driving power of the vehicle.

[0077] Still another example of an exclusive equipment system relates to a system for the vehicle's audio and video, where the first equipment specification is a simple specification and the second equipment specification is a luxurious specification. For example, it is assumed that the first equipment specification is a specification having only a radio receiver and speakers, and the second equipment specification is a specification having a multimedia player, a display device, a multi-channel speaker, a camera for photographing the outside of the vehicle, etc.

[0078] Regarding the examples of the above common equipment system and exclusive equipment system, a part of the electrical components constituting the common equipment system and a part of the electrical components constituting the exclusive equipment system may be shared by both. Also, a part of the electrical components constituting the first equipment specification set as the exclusive equipment system and a part of the electrical components constituting the second equipment specification may be common.

[0079] Note that the first equipment specification and the second equipment specification may be specifications exclusively selected during vehicle manufacturing, or may be specifications exclusively selected after vehicle manufacturing. After either the first equipment specification or the second equipment specification is selected during vehicle manufacturing, it may be changed to the other of the first equipment specification and the second equipment specification. For example, the system related to the audio and video of the vehicle can be a specification exclusively selected after vehicle manufacturing, and can also be a specification changed from one of the first equipment specification and the second equipment specification to the other after vehicle manufacturing.

[0080] <Regarding the wiring system> The wiring system 30 will be described with reference to FIG. 3. Note that in FIG. 3, the circuits 42, 45, 52, 55, 62, 65, 72, etc. indicated by a single line may include a plurality of circuits.

[0081] The wiring system 30 includes a multi-purpose wiring member 40, and further exclusively includes a first-purpose wiring member 50 and a second-purpose wiring member 60. The exclusivity here means that, as described above, when the first-purpose wiring member 50 is provided, the second-purpose wiring member 60 is not provided, and when the second-purpose wiring member 60 is provided, the first-purpose wiring member 50 is not provided, and it does not deny the possibility of the existence of a third-purpose wiring member, a fourth-purpose wiring member, etc. for the entire system 30.

[0082] The multi-purpose wiring member 40 includes a multi-purpose circuit 42, a trunk-side first-purpose circuit 43, a trunk-side second-purpose circuit 44, and a multi-purpose connector 46. Note that in FIG. 3, the single line depicted as the circuits 42, 43, 44 may include a plurality of circuits depending on the location.

[0083] The multi-purpose circuit 42, the trunk-side first-purpose circuit 43, and the trunk-side second-purpose circuit 44 are examples of trunk-side circuits.

[0084] The multi-purpose circuit 42 is constituted by a linear conductive member and is a part for transmitting electricity. The multi-purpose circuit 42 may be for transmitting electrical signals or for transmitting power. The multi-purpose circuit 42 may be, for example, the core wire in an electric wire including a core wire and a coating around the core wire. The electric wire may be an unstranded electric wire, a stranded electric wire, or in the form of a cable having a shield layer formed around it. The multi-purpose circuit 42 does not have to be the core wire in the electric wire. For example, the multi-purpose circuit 42 may be a conductor formed along a predetermined path on a flat insulating base material. For example, the multi-purpose circuit may include a circuit pattern in an FPC (Flexible Printed Circuit) in which a circuit pattern made of a metal foil or the like is formed between a pair of resin films. In the present embodiment, an explanation assuming that the multi-purpose circuit 42 is the core wire of the electric wire will be given. The explanation regarding the multi-purpose circuit 42 in this paragraph can be similarly applied to the circuits 42, 43, 44, 45, 52, 55, 62, 65, 72, etc. described below.

[0085] The multi-purpose circuit 42 is a circuit used both for the first-purpose wiring member 50 and for the second-purpose wiring member 60. In other words, the multi-purpose circuit 42 is a circuit used as an electrical transmission path both in the first equipment specification 16 and in the second equipment specification 18. That is, "multi-purpose" means having multiple uses. It can also be said that the multi-purpose circuit 42 is a circuit connected to different types of electrical components 16a, 16b, 16c, 16d or electrical components 18a, 18b, 18c according to the selected specification.

[0086] The trunk-side first-use circuit 43 is a circuit used for the first-use wiring member 50 and is an example of a trunk-side circuit classified by use. In other words, the trunk-side first-use circuit 43 is a circuit used as an electrical transmission path in the first equipment specification 16. The trunk-side first-use circuit 43 is used or not used as an electrical transmission path according to the selected specification.

[0087] The trunk-side second-use circuit 44 is a circuit used for the second-use wiring member 60 and is an example of a trunk-side circuit classified by use. In other words, the trunk-side second-use circuit 44 is a circuit used as an electrical transmission path in the second equipment specification 18. The trunk-side second-use circuit 44 is used or not used as an electrical transmission path according to the selected specification.

[0088] A plurality of trunk-side circuits including the multi-use circuit 42, the trunk-side first-use circuit 43, and the trunk-side second-use circuit 44 are grouped in a form having a plurality of connection ends, similar to the first embodiment.

[0089] The multi-use connector 46 is a connector to which at least one of the multi-use circuit 42, the trunk-side first-use circuit 43, and the trunk-side second-use circuit 44 is connected. That is, the multi-use connector 46 is an example of a trunk-side connector connected to each of the connection ends of the trunk-side circuits including the multi-use circuit 42, the trunk-side first-use circuit 43, and the trunk-side second-use circuit 44. The first-use connector 56 or the second-use connector 66 described later is exclusively connected to the multi-use connector 46.

[0090] The multi-use wiring member 40 may include a common circuit 45. The common circuit 45 is a circuit used as the same type of electrical transmission path regardless of whether the first-use wiring member 50 or the second-use wiring member 60 is selected. The common circuit 45 is, for example, a circuit electrically connected to the electrical components 12a and 12b constituting the common equipment system 12. There may be more common circuits 45, for example, more than the number of circuits related to the exclusive equipment system 14. It is not essential for the multi-use wiring member 40 to include the common circuit 45.

[0091] The multi-purpose wiring member 40 may include a common connector 48. The common connector 48 is a connector that is used as a connection interface to other wiring members or electrical components regardless of whether the first-purpose wiring member 50 or the second-purpose wiring member 60 is selected. For example, it is assumed that the common circuit 45 is connected to the common connector 48. It is not essential for the multi-purpose wiring member 40 to include the common connector 48.

[0092] The first-purpose wiring member 50 includes a first-purpose circuit 52 and a first-purpose connector 56. Three first-purpose wiring members 50 are shown in FIG. 3. The first-purpose wiring member 50 is an example of a terminal-side wiring member, the first-purpose circuit 52 is an example of a terminal-side circuit, and the first-purpose connector 56 is an example of a terminal-side connector.

[0093] The first-purpose circuit 52 is connected to the first-purpose connector 56. When the first-purpose connector 56 is connected to the multi-purpose connector 46, the multi-purpose circuit 42 is electrically connected to the first-purpose circuit 52. Also, when the first-purpose connector 56 is connected to the multi-purpose connector 46, the trunk-side first-purpose circuit 43 may be connected to the first-purpose circuit 52. Note that when the first-purpose connector 56 is connected to the multi-purpose connector 46, the trunk-side second-purpose circuit 44 is not connected to the first-purpose circuit 52.

[0094] The first-purpose circuit 52 is electrically connected to the electrical components 16a, 16b, 16c, 16d in the first equipment specification 16. The first-purpose circuit 52 may be connected to the electrical components 16a, 16b, 16c, 16d via a connector C. The other end of the first-purpose circuit 52 may be directly led to the electrical components 16a, 16b, 16c, 16d and connected to the electrical elements of the electrical components 16a, 16b, 16c, 16d without using a connector. The electrical components 16a, 16b, 16c, 16d are examples of the first electrical components.

[0095] The second-purpose wiring member 60 includes a second-purpose circuit 62 and a second-purpose connector 66. In FIG. 3, three second-purpose wiring members 60 are shown corresponding to the three first-purpose wiring members 50. The second-purpose wiring member 60 is an example of a terminal-side wiring member, the second-purpose circuit 62 is an example of a terminal-side circuit, and the second-purpose connector 66 is an example of a terminal-side connector.

[0096] It is not essential that the number of the first-purpose wiring members 50 is the same as the number of the second-purpose wiring members 60. In this case, depending on the specifications, there may be a case where there is no connection destination for the multi-purpose connector 46. The first-purpose wiring member 50 and the second-purpose wiring member 60 are exclusively assembled to the vehicle 11 according to the selected specifications. In other words, the second-purpose wiring member 60 is connected to a second electrical component (for example, electrical components 18a, 18b, 18c) that is exclusively mounted on the vehicle 11 with respect to the first electrical components (for example, electrical components 16a, 16b, 16c, 16d).

[0097] The second-purpose circuit 62 is connected to the second-purpose connector 66. When the second-purpose connector 66 is connected to the multi-purpose connector 46, the multi-purpose circuit 42 is electrically connected to the second-purpose circuit 62. When the second-purpose connector 66 is connected to the multi-purpose connector 46, the trunk-side second-purpose circuit 44 may be electrically connected to the second-purpose circuit 62. When the second-purpose connector 66 is connected to the multi-purpose connector 46, the trunk-side first-purpose circuit 43 is not electrically connected to the second-purpose circuit 62.

[0098] That is, in two states where the first-purpose connector 56 and the second-purpose connector 66 are connected to the multi-purpose connector 46, the trunk-side first-purpose circuit 43 is a circuit that is connected to the first-purpose circuit 52 but not connected to the second-purpose circuit 62, and the trunk-side second-purpose circuit 44 is a circuit that is not connected to the first-purpose circuit 52 but is connected to the second-purpose circuit 62.

[0099] The second-purpose circuit 62 is electrically connected to the electrical components 18a, 18b, and 18c in the second equipment specification 18. The second-purpose circuit 62 may be connected to the electrical components 18a, 18b, 18c, and 18d via the connector C. The other end of the second-purpose circuit 62 may be directly led to the electrical components 18a, 18b, and 18c and connected to the electrical elements of the electrical components 18a, 18b, and 18c without using a connector. The electrical components 18a, 18b, 18c, and 18d are an example of a second type of electrical component different from the first electrical component. That the types of the first electrical component and the second electrical component are different means, for example, that they can be recognized as different types as a result of different applied specifications. Note that it is also assumed that a part of the plurality of first electrical components constituting the first equipment specification and a part of the plurality of second electrical components constituting the second equipment specification are the same component.

[0100] The first-purpose connector 56 and the second-purpose connector 66 are connected to the same multi-purpose connector 46. For this reason, it is assumed that the second-purpose connector 66 is the same connector as the first-purpose connector 56. However, depending on the different numbers of the first-purpose circuit 52 and the second-purpose circuit 62, it is assumed that the number of connector terminals of the first-purpose connector 56 and the second-purpose connector 66 is different, or at least one of the first-purpose connector 56 and the second-purpose connector 66 has dummy connector terminals not connected to an electric wire.

[0101] In the first-purpose wiring member 50 or the second-purpose wiring member 60, when there are a plurality of electrical components that are connection destinations from the multi-purpose connector 46, a plurality of first-purpose circuits 52 or a plurality of second-purpose circuits 62 may branch in the middle. In FIG. 3, according to the electrical components 16b and 16c of the first equipment specification 16, a plurality of first-purpose circuits 52 branch in the middle.

[0102] Each of the first-purpose wiring member 50 and the second-purpose wiring member 60 may have terminal-side common circuits 55 and 65 for electrical components 12a and 12b in the common equipment system 12. In FIG. 3, an example is shown in which, corresponding to the electrical component 12a, the first-purpose wiring member 50 has a terminal-side common circuit 55 and the second-purpose wiring member 60 has a terminal-side common circuit 65. The terminal-side common circuit 55 is connected to the first-purpose connector 56, and the terminal-side common circuit 65 is connected to the second-purpose connector 66. When the first-purpose wiring member 50 is selected, the common circuit 45 in the multi-purpose wiring member 40 is connected to the electrical component 12a via the terminal-side common circuit 55. When the second-purpose wiring member 60 is selected, the common circuit 45 in the multi-purpose wiring member 40 is connected to the electrical component 12a via the terminal-side common circuit 65. That is, the terminal-side common circuits 55 and 65 are circuits connected to the same type of electrical components regardless of the specifications.

[0103] In FIG. 3, a terminal-side common wiring member 70 is connected to the common connector 48. The terminal-side common wiring member 70 includes a circuit 72 and a connector 76. One end of the circuit 72 is connected to the connector 76, and the other end of the circuit 72 is connected to the electrical component 12b in the common equipment system either via the connector C or without passing through the connector. By connecting the connector 76 to the common connector 48, the common circuit 45 in the multi-purpose wiring member 40 is connected to the electrical component 12b via the circuit 72. That is, the terminal-side common wiring member 70 does not include the first-purpose circuit 52 and the second-purpose circuit 62 that depend on the specifications, and is a wiring member connected to the same type of electrical components regardless of the specifications.

[0104] In the second embodiment, the multi-purpose connector 46 is a connector for ultra-thin wires, and the trunk-side circuit including the multi-purpose circuit 42, the trunk-side first-purpose circuit 43, and the trunk-side second-purpose circuit 44 includes a plurality of ultra-thin wire connector connection circuits connected to the connector for ultra-thin wires. It is conceivable that the plurality of ultra-thin wire connector connection circuits include ultra-thin wires with a conductor cross-sectional area of 0.13 sq or less as the ultra-thinnest wires with the smallest conductor cross-sectional area.

[0105] <Specific example of the wiring system> Assuming the wiring system 30 described with reference to FIG. 3, a specific example of the wiring system 30 will be described with reference to FIG. 4. In FIG. 4, circuits, connectors, etc. are described separately, but the number of circuits, routes, number of connectors, etc. are examples and can be changed according to the system and specifications to which they are applied. For convenience of explanation in FIG. 4, each circuit is distinguished by a solid line, thick line, dotted line, two-dot chain line, etc.

[0106] The multi-purpose wiring member 40 includes at least one (for example, five) multi-purpose circuits 42. Hereinafter, if necessary, a plurality of multi-purpose circuits 42 are distinguished as multi-purpose circuits 42a, 42b, 42c, 42d, 42e.

[0107] The multi-purpose wiring member 40 includes at least one (for example, six) trunk-side first-purpose circuits 43. Hereinafter, if necessary, a plurality of trunk-side first-purpose circuits 43 are distinguished as trunk-side first-purpose circuits 43a, 43b, 43c, 43d, 43e, 43f.

[0108] The multi-purpose wiring member 40 includes at least one (for example, five) trunk-side second-purpose circuits 44. Hereinafter, if necessary, a plurality of trunk-side second-purpose circuits 44 are distinguished as trunk-side second-purpose circuits 44a, 44b, 44c, 44d, 44e.

[0109] As described above, the trunk-side first-purpose circuit 43 and the trunk-side second-purpose circuit 44 are examples of trunk-side circuits for different purposes. It is also assumed that one of the trunk-side first-purpose circuit 43 and the trunk-side second-purpose circuit 44 may be omitted.

[0110] The multi-purpose connector 46 in the multi-purpose wiring member 40 is distinguished as multi-purpose connectors 46A, 46B, 46C according to the connection destination. The multi-purpose connectors 46A, 46B, 46C and the common connector 48 include, for example, a plurality of connector terminals 46a (partially shown in FIG. 4) and a connector housing 46b. Each end of the multi-purpose circuit 42, the trunk-side first-purpose circuit 43, and the trunk-side second-purpose circuit 44 is connected to any of the connector terminals 46a in the multi-purpose connectors 46A, 46B, 46C and the common connector 48.

[0111] Here, one end of the multi-purpose circuits 42a, 42b, 42c, 42d is connected to the connector terminals in the multi-purpose connector 46B, and the other end is connected to the connector terminals in the multi-purpose connector 46C. One end of the multi-purpose circuit 42e is connected to the connector terminals in the multi-purpose connector 46A, and the other end is connected to the connector terminals in the multi-purpose connector 46C.

[0112] One end of the trunk-side first-purpose circuits 43a, 43b, 43c, 43d, 43e, 43f is connected to the connector terminals in the multi-purpose connector 46A, and the other end is connected to the connector terminals in the multi-purpose connector 46B.

[0113] One end of the trunk-side second-purpose circuits 44a, 44b, 44c is connected to the connector terminals in the multi-purpose connector 46A, and the other end is connected to the connector terminals in the multi-purpose connector 46C. One end of the trunk-side second-purpose circuits 44d, 44e is connected to the connector terminals in the multi-purpose connector 46B, and the other end is connected to the connector terminals in the multi-purpose connector 46C.

[0114] Note that one end of the common circuit 45 is connected to the connector terminals in the multi-purpose connector 46A, and the other end is connected to the connector terminals in the common connector 48. When the above-mentioned plurality of circuits pass through the same path, the plurality of circuits may be kept bundled by a bundling member 90 such as an adhesive tape or a binding band.

[0115] In this example of the multi-purpose wiring member 40, the total number of circuits is 17, and the total number of circuits for the exclusive equipment system 14 excluding the common circuit 45 is 16. Also, the number of circuits of the multi-purpose circuit 42 is 5. Therefore, the number of the multi-purpose circuit 42 with respect to the total 17 circuits in the multi-purpose wiring member 40 is approximately 29.41%. The number of circuits of the multi-purpose circuit 42 with respect to the total 16 circuits for the exclusive equipment system 14 is 31.25%.

[0116] A plurality of first-purpose wiring members 50 are distinguished as first-purpose wiring members 50A, 50B, and 50C. The first-purpose wiring member 50A is connected to the multi-purpose connector 46A, the first-purpose wiring member 50B is connected to the multi-purpose connector 46B, and the first-purpose wiring member 50C is connected to the multi-purpose connector 46C. Looking at the first equipment specification 16, the first-purpose wiring member 50A is connected to the electrical component 16a, the first-purpose wiring member 50B is connected to the electrical components 16b and 16c, and the first-purpose wiring member 50C is connected to the electrical component 16d.

[0117] The first-purpose wiring member 50A has at least one (for example, seven) first-purpose circuits 52 and a terminal-side common circuit 55. The plurality of first-purpose circuits 52 are distinguished as first-purpose circuits 52a, 52b, 52c, 52d, 52e, 52f, and 52g.

[0118] When the first-purpose connector 56 is connected to the multi-purpose connector 46A, the first-purpose circuits 52a, 52b, 52c, 52d, 52e, and 52f are electrically connected to the trunk-side first-purpose circuits 43a, 43b, 43c, 43d, 43e, and 43f, and the first-purpose circuit 52g is connected to the multi-purpose circuit 42e. For this reason, the trunk-side first-purpose circuits 43a, 43b, 43c, 43d, 43e, and 43f and the multi-purpose circuit 42e are electrically connected to the electrical component 16a via the first-purpose circuits 52a, 52b, 52c, 52d, 52e, 52f, and 52g.

[0119] The common circuit 45 is electrically connected to the electrical component 12a via the terminal-side common circuit 55. The trunk-side second-purpose circuits 44a, 44b, and 44c are open circuits on the multi-purpose connector 46A side.

[0120] The first-purpose wiring member 50B has at least one (e.g., ten) first-purpose circuits 52. The plurality of first-purpose circuits 52 branch off on the way away from the first-purpose connector 56 and are connected to the electrical components 16b and 16c. When the first-purpose connector 56 is connected to the multi-purpose connector 46B, the first-purpose circuits 52 are connected to the trunk-side first-purpose circuits 43a, 43b, 43c, 43d, 43e, 43f and the multi-purpose circuits 42a, 42b, 42c, 42d. Therefore, the trunk-side first-purpose circuits 43a, 43b, 43c, 43d, 43e, 43f and the multi-purpose circuits 42a, 42b, 42c, 42d are electrically connected to the electrical component 16b or the electrical component 16c via the first-purpose circuits 52 of the first-purpose wiring member 50B. In this case, in the multi-purpose connector 46B, the trunk-side second-purpose circuits 44d and 44e are in an open state.

[0121] Also, the first-purpose wiring member 50C has at least one (e.g., five) first-purpose circuits 52. When the first-purpose connector 56 is connected to the multi-purpose connector 46C, the first-purpose circuits 52 are connected to the multi-purpose circuits 42a, 42b, 42c, 42d, 42e. Therefore, the multi-purpose circuits 42a, 42b, 42c, 42d, 42e are electrically connected to the electrical component 16d via the first-purpose circuits 52 of the first-purpose wiring member 50C. In this case, in the multi-purpose connector 46C, the trunk-side second-purpose circuits 44a, 44b, 44c, 44d, 44e are in an open state.

[0122] Similar to the above, the plurality of second-purpose wiring members 60 are distinguished as second-purpose wiring members 60A, 60B, and 60C.

[0123] The second-purpose wiring member 60A has at least one (e.g., three) second-purpose circuits 62 and a terminal-side common circuit 65. The plurality of second-purpose circuits 62 are distinguished as second-purpose circuits 62a, 62b, 62c, and 62d.

[0124] When the second-use connector 66 is connected to the multi-use connector 46A, the second-use circuits 62a, 62b, 62c are electrically connected to the trunk-side second-use circuits 44a, 44b, 44c, and the second-use circuit 62d is connected to the multi-use circuit 42e. For this reason, the trunk-side second-use circuits 44a, 44b, 44c and the multi-use circuit 42e are electrically connected to the electrical component 18a via the second-use circuits 62a, 62b, 62c, 62d.

[0125] Similar to the case where the first-use wiring member 50A is selected, the common circuit 45 is electrically connected to the electrical component 12a via the terminal-side common circuit 65. Different from the case where the first-use wiring member 50A is selected, the trunk-side first-use circuits 43a, 43b, 43c, 43d, 43e, 43f are in an open state on the multi-use connector 46A side.

[0126] The second-use wiring member 60B has at least one (for example, six) second-use circuits 62. When the second-use connector 66 is connected to the multi-use connector 46B, the second-use circuits 62 are connected to the trunk-side second-use circuits 44d, 44e and the multi-use circuits 42a, 42b, 42c, 42d. For this reason, the trunk-side second-use circuits 44d, 44e and the multi-use circuits 42a, 42b, 42c, 42d are electrically connected to the electrical component 18b via the second-use circuits 62 of the second-use wiring member 60B. In this case, on the multi-use connector 46B, the trunk-side first-use circuits 43a, 43b, 43c, 43d, 43e, 43f are in an open state.

[0127] Also, the second-use wiring member 60C has at least one (for example, ten) second-use circuits 62. When the second-use connector 66 is connected to the multi-use connector 46C, the second-use circuits 62 are connected to the multi-use circuits 42a, 42b, 42c, 42d, 42e and the trunk-side second-use circuits 44a, 44b, 44c, 44d, 44e. For this reason, the multi-use circuits 42a, 42b, 42c, 42d, 42e and the trunk-side second-use circuits 44a, 44b, 44c, 44d, 44e are electrically connected to the electrical component 18c via the second-use circuits 62 of the second-use wiring member 60C.

[0128] When the wiring system 30 is applied to the first equipment specification 16, the first-purpose wiring members 50A, 50B, and 50C are selected. In this case, the multi-purpose circuit 42 and the trunk-side first-purpose circuit 43 in the multi-purpose wiring member 40 are used, and the trunk-side second-purpose circuit 44 remains unused with each connector open.

[0129] When the wiring system 30 is applied to the second equipment specification 18, the second-purpose wiring members 60A, 60B, and 60C are selected. In this case, the multi-purpose circuit 42 and the trunk-side second-purpose circuit 44 in the multi-purpose wiring member 40 are used, and the trunk-side first-purpose circuit 43 remains unused with each connector open.

[0130] In any case, the multi-purpose circuit 42 is used. That is, the multi-purpose circuit is used as a circuit for multiple specifications. As the multi-purpose circuit is commonly used as a multi-purpose circuit among multiple specifications, the number of circuits can be reduced as a wiring member for multiple specifications.

[0131] In the second embodiment, at least one of the multi-purpose circuit 42, the trunk-side first-purpose circuit 43, the trunk-side second-purpose circuit 44, and the common circuit 45 may include an ultra-thin wire with a conductor cross-sectional area of 0.13 sq or less as the ultra-thin wire with the smallest conductor cross-sectional area. For example, the signal circuit among the multi-purpose circuit 42, the trunk-side first-purpose circuit 43, the trunk-side second-purpose circuit 44, and the common circuit 45 may be the ultra-thin wire. Also, for example, only some or all of the circuits in the multi-purpose circuit 42 may be the ultra-thin wire. Also, for example, only some or all of the circuits in the trunk-side first-purpose circuit 43 and the trunk-side second-purpose circuit 44 may be the ultra-thin wire.

[0132] Depending on the application mode of the ultra-thin wire to the circuit, all of the plurality of multi-purpose connectors 46A, 46B, 46C can be connectors for ultra-thin wires, or some of the plurality of multi-purpose connectors 46A, 46B, 46C can be connectors for ultra-thin wires. For example, if only the trunk-side first-use circuit 43 is the ultra-thin wire, the multi-purpose connectors 46A and 46B are connectors for ultra-thin wires, and the multi-purpose connector 46C is not a connector for ultra-thin wires. Also, for example, if the multi-purpose circuit 42 is the ultra-thin wire, all of the multi-purpose connectors 46A, 46B, and 46C are connectors for ultra-thin wires.

[0133] <Example for comparison> For comparison, assume a case where no multi-purpose circuit is used. As a first example, FIG. 5 shows a wiring system 130 dedicated to the first equipment specification 16. In this case, it is assumed that the trunk-side wiring member 140 has a configuration in which the trunk-side second-use circuit 44 is omitted in the multi-purpose wiring member 40 of the wiring system 30. It is assumed that connectors C1 of a size having a number of connector terminals corresponding to the reduced number of circuits are used in the connectors of the trunk-side wiring member 140 and the first-use wiring member 150 corresponding to the first-use wiring member 50. The total number of circuits of this trunk-side wiring member 140 is 12, and the total number of circuits related to the exclusive equipment system is 11.

[0134] As a second example, FIG. 6 shows a wiring system 230 dedicated to the second equipment specification 18. In this case, it is assumed that the trunk-side wiring member 240 has a configuration in which the trunk-side first-use circuit 43 is omitted in the multi-purpose wiring member 40 of the wiring system 30. It is assumed that connectors C2 of a size having a number of connector terminals corresponding to the reduced number of circuits are used in the connectors of the trunk-side wiring member 240 and the second-use wiring member 260 corresponding to the second-use wiring member 60. The total number of circuits of this trunk-side wiring member 240 is 11, and the total number of circuits related to the exclusive equipment system is 10.

[0135] When preparing separate main-line side wiring members 140 and 240 for the first equipment specification 16 and the second equipment specification 18, the management part numbers and management inventories of the wiring members increase. To be compatible with both the first equipment specification 16 and the second equipment specification 18, if the main-line side wiring members 140 and 240 are simply combined, the number of circuits will increase too much. For example, if the main-line side wiring members 140 and 240 are simply combined, the number of circuits becomes 22 by subtracting the number of common circuits 45 from the simple sum of the total number of circuits. Considering only the circuits related to the exclusive equipment system, the total number after combination is 21.

[0136] In contrast, in this wiring system 30, the multi-purpose circuit 42 is used for both the first equipment specification 16 and the second equipment specification 18. The differences in circuit length, route, connection configuration, etc. caused by the type differences between the electrical components 16a, 16b, 16c, 16d of the first equipment specification 16 and the electrical components 16a, 16b, 16c of the second equipment specification 18 are eliminated by the first-purpose wiring member 50 or the second-purpose wiring member 60. The number of circuits can be reduced by the amount that the multi-purpose circuit 42 is used. In the example shown in FIG. 4, since the multi-purpose wiring member 40 includes five multi-purpose circuits 42, five circuits are reduced compared to the case where the main-line side wiring members 140 and 240 are simply combined.

[0137] The larger the ratio of the number of multi-purpose circuits 42 to the total number of circuits in the multi-purpose wiring member 40, the higher the circuit reduction effect. For example, the number of multi-purpose circuits to the total number of all circuits in the multi-purpose wiring member 40 may be 10% or more. The number of multi-purpose circuits to the total number of all circuits in the multi-purpose wiring member 40 is preferably 15% or more, more preferably 20% or more, still more preferably 25% or more, and even more preferably 30% or more.

[0138] Similarly, the ratio of the number of multi-purpose circuits 42 to the total number of circuits for the exclusive equipment system 14 in the multi-purpose wiring member 40 may also be 10% or more, preferably 15% or more, more preferably 20% or more, still more preferably 25% or more, and even more preferably 30% or more.

[0139] In addition, the circuits in the main line side wiring members 140 and 240 may include an ultra-thin wire with a conductor cross-sectional area of 0.13 sq or less as the thinnest wire with the smallest conductor cross-sectional area.

[0140] <Examples of connection destinations of multi-purpose circuits> FIG. 7 is an explanatory diagram showing an example of a connection destination of the multi-purpose circuit 42. In FIG. 7, examples of the multi-purpose circuits 42a, 42b, 42c, and 42d being connected to the electrical component 16c via the first-use wiring member 50 and being connected to the electrical component 18b via the second-use wiring member 60 are shown.

[0141] As shown in FIG. 7, the multi-purpose circuit 42 includes circuits 42c and 42d that transmit different types of electricity in a state where the first-use connector 56 is connected to the multi-purpose connector 46B and in a state where the second-use connector 66 is connected to the multi-purpose connector 46B.

[0142] Circuits that transmit different types of electricity are, for example, circuits in which the applied voltage, the assumed maximum current value, or the signal format is different between the first equipment specification 16 and the second equipment specification 18.

[0143] The multi-purpose connector 46 may include circuits 42c and 42d that transmit different electricity with respect to any of power supply, ground, and signal in a state where the first-use connector 56 is connected to the multi-purpose connector 46B and in a state where the second-use connector 66 is connected to the multi-purpose connector 46B.

[0144] In the example shown in FIG. 7, when the first-use connector 56 of the first-use wiring member 50 is connected to the multi-purpose connector 46B, the multi-purpose circuit 42c is connected to the actuator 81 and becomes a circuit for supplying power to the actuator 81. On the other hand, when the second-use connector 66 of the second-use wiring member 60 is connected to the multi-purpose connector 46B, the multi-purpose circuit 42c is connected to the sensor 83 and becomes a circuit for transmitting a detection signal.

[0145] Also, when the first-usage connector 56 of the first-usage wiring member 50 is connected to the multi-usage connector 46B, the multi-usage circuit 42d is connected to the communication circuit 82 and becomes a circuit for transmitting communication signals. On the other hand, when the second-usage connector 66 of the second-usage wiring member 60 is connected to the multi-usage connector 46B, the multi-usage circuit 42d is connected to the ground circuit 84 and becomes a circuit for transmitting electricity for grounding.

[0146] The cross-sectional size of the multi-usage circuit 42 is not particularly limited. For example, when the multi-usage circuit 42 is the core wire of an electric wire, the cross-sectional area of the core wire may be classified into any of 0.13 sq, 0.35 sq, 0.5 sq, and 2 sq. "sq" is a standard regarding the cross-sectional area of the core wire defined by the JIS standard and means square mm. The multi-usage circuit 42 can be used for various electrical transmission applications within the range of current allowed according to the cross-sectional area, material, etc. of the circuit.

[0147] The ultra-thin wire is preferably applied to the circuit for transmitting signals regardless of whether the first-usage wiring member 50 or the second-usage wiring member 60 is connected, but this is not essential.

[0148] <Effects, etc.> According to the wiring system 30 configured as described above, the same effects as those of the first embodiment can be obtained.

[0149] Also, according to this wiring system 30, the multi-usage circuit 42 is connected to both the first-usage circuit 52 and the second-usage circuit 62. Therefore, compared with the case where circuits connected to the first-usage circuit 52 and circuits connected to the second-usage circuit 62 are separately prepared in the trunk-side wiring member, the total number of circuits can be reduced. Thereby, while reducing the number of circuits, it is possible to easily correspond to the specifications of multiple vehicles.

[0150] Assuming a multi-purpose wiring member 40 having such advantages, the trunk-side circuit has a multi-purpose circuit 42 and trunk-side use-specific circuits. Therefore, the number of circuits in the multi-purpose wiring member 40 is assumed to be greater than at least one of the number of circuits in the wiring system 130 dedicated to the first equipment specification and the number of circuits in the wiring system 230 dedicated to the second equipment specification. For this reason, when an ultra-thin wire is connected to the multi-purpose connector 46 as a connector for ultra-thin wires, the tensile force on the ultra-thin wire can be received by a larger number of circuits.

[0151] Also, with the first-use connector 56 or the second-use connector 66 as a terminal-side connector connected to the multi-purpose connector 46 as a connector for ultra-thin wires, at least one of the circuits connected to the multi-purpose connector 46 is in an open state. For example, when the first-use connector 56 is connected to the multi-purpose connector 46, the trunk-side second-use circuit 44 is kept in an open state. Also, for example, when the second-use connector 66 is connected to the multi-purpose connector 46, the trunk-side first-use circuit 43 is kept in an open state. The open circuit is not used for connection to other electrical components. The open circuit may be an ultra-thin wire or an ultra-ultra-thin wire, or may be a wire thicker than the ultra-thin wire. By using the wire applied to such an open circuit, the tensile force on the ultra-ultra-thin wire can be dispersed.

[0152] [Modification Example] Note that the respective configurations described in the above embodiments and each modification example can be appropriately combined as long as they do not contradict each other.

Explanation of Reference Numerals

[0153] 1, 30, 130, 230 Wiring systems 2, 140, 240 Trunk-side wiring members 3 Trunk-side circuit 3B, 90, 490 Binding members 3Ea, 3Eb, 3Ec Connection ends 3M Trunk 3T, 7T, 46a Connector terminals 3a Ultra-thin wire 3b Wire 3p, 7p Core wire 3q, 7q Coating 4a, 4b, 4c Trunk side connector 5a, 5b, 5c Terminal side wiring member 6a, 6b, 6c Terminal side connector 7 Terminal side circuit 9A, 9B, 9C, 9D, 9E, 12a, 12b Electrical components 11 Vehicle 12 Common equipment system 14 Exclusive equipment system 16 First equipment specification 16a, 16b, 16c, 16d First electrical components 18 Second equipment specification 18a, 18b, 18c Second electrical components 40 Multi-purpose wiring member 42(42a, 42b, 42c, 42d, 42e) Multi-purpose circuit 43(43a, 43b, 43c, 43d, 43e, 43f) Trunk side first-purpose circuit 44(44a, 44b, 44c, 44d, 44e) Trunk side second-purpose circuit 45 Common circuit 46(46A, 46B, 46C) Multi-purpose connector 46b Connector housing 48 Common connector 50(50A, 50B, 50C), 150 First-purpose wiring member 52(52a, 52b, 52c, 52d, 52e, 52f, 52g) First-purpose circuit 55 Terminal side common circuit 56 First-purpose connector 60(60A, 60B, 60C), 260 Second-purpose wiring member 62(62a, 62b, 62c, 62d) Second-purpose circuit 65 Terminal side common circuit 66 Second-purpose connector 70 Terminal side common wiring member 72 Circuit 81 Actuator 82 Communication circuit 83 Sensor 84 Ground circuit C, C1, C2, 76 Connectors R Reinforce

Claims

1. A trunk-side wiring member including a plurality of trunk-side circuits and a plurality of trunk-side connectors, wherein the plurality of trunk-side circuits are grouped in a form having a plurality of connection ends, and the plurality of trunk-side connectors are connected to respective ones of the plurality of connection ends, A terminal-side wiring member including a terminal-side connector connected to any one of the plurality of trunk-side connectors and a terminal-side circuit connected to the terminal-side connector, wherein when the terminal-side connector is connected to any one of the plurality of trunk-side connectors, the terminal-side circuit is electrically connected to at least a part of the plurality of trunk-side circuits, Comprising: The plurality of trunk-side connectors include connectors for ultra-thin wires, The plurality of trunk-side circuits include a plurality of ultra-thin wire connector connection circuits connected to the ultra-thin wire connectors, The plurality of ultra-thin wire connector connection circuits include ultra-thin wires having a conductor cross-sectional area of 0.13 sq or less as the ultra-thinnest wires having the smallest conductor cross-sectional area, The terminal-side circuit has a relatively thick wire having a conductor cross-sectional area larger than that of the ultra-thinnest wire, A wiring system in which the ultra-thinnest wire is connected to the relatively thick wire by connecting the terminal-side connector to the ultra-thin wire connector.

2. The wiring system according to claim 1, The plurality of trunk-side circuits have a multi-purpose circuit and trunk-side use-specific circuits, As the terminal-side wiring member, A first-use wiring member including a first-use connector as the terminal-side connector and a first-use circuit as the terminal-side circuit, A second-use wiring member including a second-use connector as the terminal-side connector and a second-use circuit as the terminal-side circuit, Exclusively comprising: When the first-use connector is connected to the ultra-thin wire connector, the multi-purpose circuit is connected to the first-use circuit, and when the second-use connector is connected to the ultra-thin wire connector, the multi-purpose circuit is connected to the second-use circuit, The trunk-side use-specific circuits are connected to the first-use circuit when the first-use connector is connected to the ultra-thin wire connector, or are connected to the second-use circuit when the second-use connector is connected to the ultra-thin wire connector. A wiring system.

3. The wiring system according to claim 1 or claim 2, A wiring system in which, with the terminal-side connector connected to the ultra-thin wire connector, at least one of the plurality of trunk-side circuits connected to the ultra-thin wire connector is in an open state.

4. The wiring system according to any one of Claims 1 to 3, wherein the ultra-thinnest wire is an ultra-thin wire having a conductor cross-sectional area of 0.08 sq or less.

5. The wiring system according to any one of Claims 1 to 4, wherein the terminal-side wiring member includes a plurality of the terminal-side circuits, and in a state where the terminal-side connector is connected to the ultra-thin wire connector, the plurality of terminal-side circuits branch from the terminal-side connector and are connected to a plurality of electrical components.

6. The wiring system according to any one of Claims 1 to 5, wherein the ratio of the number of the ultra-thin wires having a conductor cross-sectional area of 0.13 sq or less to the total number of the plurality of trunk-side circuits is 40% or more.

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